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Move get_attdisbursion to lsyscache. Clean up get_typdefault.

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This commit is contained in:
Tom Lane
1999-08-09 03:13:31 +00:00
parent e9054829a2
commit 5af4b04f31
5 changed files with 187 additions and 131 deletions
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111
src/backend/utils/cache/syscache.c vendored
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/cache/syscache.c,v 1.33 1999/07/20 17:14:06 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/cache/syscache.c,v 1.34 1999/08/09 03:13:30 tgl Exp $
*
* NOTES
* These routines allow the parser/planner/executor to perform
@ -631,112 +631,3 @@ SearchSysCacheGetAttribute(int cacheId,
heap_close(relation);
return returnValue;
}
/*
* TypeDefaultRetrieve
*
* Given a type OID, return the typdefault field associated with that
* type. The result is a Datum, and points to palloc'd storage for
* non-pass-by-value types.
*
* [identical to get_typdefault, expecting a (struct varlena *) as ret val.
* some day, either of the functions should be removed -ay 10/94]
*/
void *
TypeDefaultRetrieve(Oid typId)
{
struct varlena *typDefault;
int32 dataSize;
HeapTuple typeTuple;
Form_pg_type type;
int32 typByVal,
typLen;
void *returnValue;
/*
* First, see if there is a non-null typdefault field (usually there isn't)
*/
typDefault = (struct varlena *)
SearchSysCacheGetAttribute(TYPOID,
Anum_pg_type_typdefault,
ObjectIdGetDatum(typId),
0, 0, 0);
if (typDefault == NULL)
{
#ifdef CACHEDEBUG
elog(DEBUG, "TypeDefaultRetrieve: No extractable typdefault in %s(%d)",
cacheinfo[TYPOID].name, TYPOID);
#endif /* defined(CACHEDEBUG) */
return NULL;
}
dataSize = VARSIZE(typDefault) - VARHDRSZ;
/*
* Need the type's length and byVal fields.
*
* XXX silly to repeat the syscache search that SearchSysCacheGetAttribute
* just did --- but at present this path isn't taken often enough to
* make it worth fixing.
*/
typeTuple = SearchSysCacheTuple(TYPOID,
ObjectIdGetDatum(typId),
0, 0, 0);
if (!HeapTupleIsValid(typeTuple))
{
/* should never get here, really... */
#ifdef CACHEDEBUG
elog(DEBUG, "TypeDefaultRetrieve: Lookup in %s(%d) failed",
cacheinfo[TYPOID].name, TYPOID);
#endif /* defined(CACHEDEBUG) */
return NULL;
}
type = (Form_pg_type) GETSTRUCT(typeTuple);
typLen = type->typlen;
typByVal = type->typbyval;
if (typByVal)
{
int8 i8;
int16 i16;
int32 i32 = 0;
if (dataSize == typLen)
{
switch (typLen)
{
case sizeof(int8):
memcpy((char *) &i8, VARDATA(typDefault), sizeof(int8));
i32 = i8;
break;
case sizeof(int16):
memcpy((char *) &i16, VARDATA(typDefault), sizeof(int16));
i32 = i16;
break;
case sizeof(int32):
memcpy((char *) &i32, VARDATA(typDefault), sizeof(int32));
break;
}
returnValue = (void *) i32;
}
else
returnValue = NULL;
}
else
{
if ((typLen < 0 && dataSize < 0) || dataSize != typLen)
returnValue = NULL;
else
{
returnValue = (void *) palloc(VARSIZE(typDefault));
memcpy((char *) returnValue,
(char *) typDefault,
(int) VARSIZE(typDefault));
}
}
return returnValue;
}